Data Science
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Learn how to analyze data effectively and manage databases with ease.

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πŸ”° Math Topics every Data Scientist should know
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πŸ”… Introduction to PostgreSQL

πŸ“ Get an introduction to PostgreSQLβ€”what it is, what it can do, and how to start using it.

🌐 Author: Sarah Conway Schnurr
πŸ”° Level: Beginner
⏰ Duration: 48m

πŸ“‹ Topics: PostgreSQL

πŸ”— Join Data Analysis for more courses
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Introduction to PostgreSQL.zip
80.6 MB
πŸ“±Data Analysis
πŸ“±Introduction to PostgreSQL
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πŸ”° Top 5 Clustering Techniques in Data Science
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πŸ”— Best Youtube Channels To Master Data Analysis
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πŸ“– Must-Know Concepts in Data Science

Whether you’re building models, leading teams, or breaking into the field β€” there are a few core concepts you need to understand deeply (not just mention in interviews).


In this carousel, we break down:

βœ… Supervised vs Unsupervised learning

βœ… Overfitting & underfitting

βœ… Cross-validation strategies

βœ… Precision vs recall trade-offs

βœ… Feature engineering techniques

βœ… Dimensionality reduction methods
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πŸ“– Must-Know Concepts in Data Science
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πŸ”… Hands-On PostgreSQL Project: Spatial Data Science

πŸ“ Learn how to perform advanced Spatial SQL operations, from setting up a local database to importing public data sets and running queries to perform spatial joins.

🌐 Author: Maggie Ma
πŸ”° Level: Intermediate
⏰ Duration: 1h 45m

πŸ“‹ Topics: Data Manipulation, DBeaver, PostgreSQL

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Hands-On PostgreSQL Project: Spatial Data Science.zip
278.9 MB
πŸ“±Data Science
πŸ“±Hands-On PostgreSQL Project: Spatial Data Science
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πŸ’‘ How to grab a data analyst internship
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To choose the right graph for data visualization, you should first understand your data and the message you want to convey

Consider what you want to show (trends, comparisons, distributions, relationships, etc.) and then select a graph type that effectively communicates that information. πŸ“

Here's a breakdown of common chart types and their uses:

1. Showing Change Over Time: ⏳

β€’ Line charts: Ideal for showing trends and patterns in continuous data over time.
β€’ Area charts: Useful for visualizing trends and showing the magnitude of change, especially when comparing multiple series.
β€’ Column/Bar charts: Can also be used to show trends, especially for discrete data or when comparing values across categories at specific points in time.

2. Comparing Values: βš–οΈ

β€’ Bar charts: Excellent for comparing values across different categories, highlighting differences and outliers.
β€’ Column charts: Similar to bar charts but better for showing change over time or comparing categories, particularly when there are many categories or a large number of data points.
β€’ Pie charts: Best for showing the composition of a whole, especially when you have a small number of categories (ideally less than 5).
β€’ Scatter plots: Useful for examining relationships between two variables and identifying clusters or patterns.
β€’ Bubble charts: Expand on scatter plots by adding a third dimension (size of the bubble), allowing you to visualize relationships between three variables.

3. Showing Distribution: πŸ“Š

β€’ Histograms: Show the distribution of a single variable, revealing how frequently different values occur.
β€’ Scatter plots: Can also be used to show the distribution of two variables simultaneously.
β€’ Box plots: Provide a visual summary of the distribution, showing the median, quartiles, and potential outliers.

4. Showing Relationships: πŸ”—

β€’ Scatter plots: Best for exploring relationships between two variables.
β€’ Bubble charts: Can visualize relationships between three variables.